带有减振装置的转子采掘机振动

应用统计学和动力学的几个拓扑理论和有关矩阵方法，对带有减振器的重型机械－采掘机的振动问题进行了研究。参考2PT－400－17／1.3型机器的动力模型，分析了该系统的自由振动特性，给出了详细的分析过程和结果；在此基础上，深入分析了系统在强迫振动下的幅度－频率特性，并给出了详细的分析过程和结果。     

绳状绞边装置的模糊优化设计

就绳状绞边装置的设计问题，根据模糊数学的基本理论提出了一种模糊优化设计方法，建立了该问题的模糊优化设计的数学模型，并对实例进行了计算与分析．     

Second generation YBCO coated conductors： A review

The advance in first generation Bi-2223 HTS wire has enabled the demonstration of superconducting power cables, magnetic energy-storage devices, transformers,fault current limiters and motors. However, the low irreversibility field (H^*) prevents application of Bi-2223 at 77 Kin any significant field. Worldwide activities are therefore,focused on developing a second-generation HTS technology based on YBCO, for which H^* (77K)-7 T. In this paper, we discuss the status and commercial prospects of second generation HTS wire technologies. In addition, we review the recent results and discuss the prospects of future applications.     

TCP-Rab： a receiver advertisement based TCP protocol

With the evolution of network technologies, the deficiencies of TCP protocol are becoming more and more distinct. The new TCP implementation, called Receiver Advertisement Based TCP (TCP-Rab) proposed here to eliminate these deficiencies, adopts two basic mechanisms: (1) Bandwidth Estimation and (2) Immediate Recovery. Bandwidth estimation is carried out at the receiver, and the result is sent back to the sender via the acknowledgements. Immediate Recovery guarantees high performance even in lossy link. Rab can distinguish the reason for packet loss, and thus adopt appropriate recovery strategy. For loss by network congestion, it will back off its congestion window, and for loss by link errors, it will recover the congestion window immediately. Simulations indicated that Rab has superiority over other TCP implementations.     

装载机工作装置优化设计的方法与策略

讨论了装载机工作装置优化设计过程所具有的基本特点和规律,提出了相应的处理方法和对策。从建立一个完整专业ＣＡＤ系统的角度,讨论了优化设计作为其中的一个子系统与其他子系统之间的关系及合理的任务分工,提出了优化设计模型。从人仍然是设计自动化过程的主体这一观点出发,对系统结构进行了规划,并提出了优化设计过程的控制方法。     

简析制动逻辑控制装置在SS9型电力机车上的应用

以SS9型电力机车为例介绍了制动逻辑控制装置(DKL)的结构、简单工作原理及特点,并对其控制逻辑关系进行了阐述.     

静电喷粉装置电气火灾事故案例分析及防范措施

本文通过静电喷粉装置电气火灾事故的案例分析,可以促使各行业使用静电喷粉装置单位的安全管理人员能了解此类事故发生的原因和规律,汲取事故的教训,从而在工作中有意识地加强管理,预防和减少此类事故的发生.     

浅析斜井串车提升跑车事故的原因及预防措施

分析了跑车事故原因及危害,探讨了预防斜井串车提升跑车事故的措施。     

Plasma sheet stretching accompanied by field aligned energetic ion fluxes observed by the NUADU instrument aboard TC-2

The NUADU (NeUtral Atom Detector Unit) instrument aboard TC-2 recorded 4л solid angle images of charged particles (E >180 keV) spiraling around the magnetic field lines in the near-Earth plasma sheet (at ~ -7 RE, equatorial dawn-to-night side) during a geomagnetic storm (Dst =-219 nT) on August 24, 2005. Energetic ion beam events characterized by symmetrical, ring-like, solid angle distributions around ambient magnetic field lines were observed during a 34-minute traversal of the plasma sheet by the TC-2 spacecraft. Also, observations during these multiple crossings of the plasma sheet were monitored by the magnetometer experiment (FGM) aboard the same spacecraft. During each crossing, a whistler-mode chorus enhancement was observed in the anisotropic area by the TC-2 low frequency electromagnetic wave detector (LFEW/TC-2) at a frequency just above that of the local lower hybrid wave. A comparison of the ion pitch angle distribution (PAD) map with the ambient magnetic field shows that an enhancement in the field aligned energetic ion flux was accompanied by tailward stretching of the magnetic field lines in the plasma sheet. In contrast, the perpendicular ion-flux enhancement was accompanied by a signature indicating the corresponding shrinkage of the magnetic field lines in the plasma sheet. Since both parallel ion-flux and perpendicular ion-flux enhancements occurred intermittently, the data were interpreted to imply a dynamical, oscillatory process of the magnetic field line (stretching and shrinking) in the near-Earth plasma sheet, which might have acted to help establish an interaction region in this area which would support continuous aurora-substorm triggering during the ongoing magnetic storm. The whistler-mode chorus may have been produced due to ion gyro-resonance during particle pitch angle diffusion after the plasma sheet compression.     

NP系列声波除灰装置在锅炉上的应用效果及技术经济分析

声波除灰的原理是近壁面的气流边界层在声振动作用下断续存在形成声波,且伴有烟气逆向流动,烟气流的声震荡周期性地改变边界层的压力纵向梯度,这种不稳定流动使灰粒难以在管壁表面沉积,进而被逆向流动的烟气携带出锅炉,从而达到除灰目的。NP系列声波除灰装置具有除灰效果优异、运行安全可靠、节能降耗、维护及操作简便等特性。